Pneumatic fan



De.`11,1923. f 1,477,469 H c. WALLACE PNEUMATIG FAN Filed sept. 2, 1920 IHIIIIII Patented hier.. il, i923;

einen HALBERT C. WALLACE, OF KANSAS CT'Y, HSOUR, .LSSGNR- 0F THREE-FGURTHS T0 FESSE 2. VJALLALGE, .KANSAS CTY, MSSURI.

PNEUMMC FAN.

Application filed September T all whom t may concern.'

Be it known that i, Herinner TVALLACE, citizen el3 the United States, residing at (enses City, in the county of Jackson and ,State lliissouri, have invented certain new and nset'ul irnjiiroveinents in Pneumatic Fans; and l do declare the following to be Jfull. clear, and enact description of the invention, such as will enable others skilled in the art to `which it appertains te ina-ire and use the sinne, reference being` had to the accompanying drawings, and to the lett rs and figures of reference marked triereon, which .torni a part oit this speciiicatimi. j

This invention relates to pneumatic elevators andl particularly to a fan for elevating` grain by pneumatic pressure.

Fans have long been need ior the purpose oit elevating grain but there is a serions obection to known types ot 'fans in that there liability or" grain gravitating` to the bottoni ot the ian case with attendant disadvanta-ges.

have provided av novel construction of fan by ineans of which thel grain may be passed through the fan case Without liability ot gravitating or precipitating to the bottoin ot' the 'fan case, the construction being such that the. grain Will be picked np by the fan blades and the incoming air in such a inanner that the velocity of the grain will be increased as soon as it enters the tan case to a speed su'liicient to overcome the gravity thereof.

My invention contemplates :i construction in which fan casing provided hav ing an air inlet on one side and a grain inlet on the other, the two inlets beiiv -j concentric one with the. other but eccentric with respect to the nin shalft or air iinpeller in the casing. I also prefer to slightly tip` the blades of the air inpeller se as to cause the grain to tend to slide across `the air inpeller from the grain side to the air side Where it Will receive its greatest velocity before being ejected from the fan case. The novel construction of the invention will be apparent by reference to the accompanying` 2, 1929. Serial No. 407,970.

Fig. 3 is a sectional vieiv of a slightly inodiiied form oi ian construction, and

F Ll isr a l fragmentary, perspective view ot' the tip end of one et the blades.

rlhe fan casing is ci the snail shell type and it is illustrated as consisting of a chanr .ber or casing l having Catangential outlet 2,

vposits Wall, the inlets 6 and 7, however, be-

ing eccentric with respect to the shaft. rlhere is a chute or hopper 8 provided for the grain whereby the grain may enter the fan casing l opposite the air inlet 6. The shaft 3 is novided with a pulley 9 about which a ybelt may be placed to drive the fan impeller consisting of the shaft 3 and the blades 4.

Since the openings 6 and 7 are eccentric to the axis of the air impeller with the niej or portions of the inlets slightly oli center, the air entering the fen will be subjected to a rapid velocity increase. because it vvill be subjected to an appreciable portion of the tun blade surface as soon as it enters the casing and as it slides toward the ends of the fan blades, it will be subjected to the peripheral speed thereof whereby there Will be n rapid acceleration et velocity oli the air about the iinpeller.v The incoming grain will likewise be subjected to an increased acceleration of velocity.

lf the blades are tipped or inclined so that their forward edge portions will be adjacent to the grain inlet side, there will be a tendency for the grain to' slide over the blades and thereby get full effect of the velocity of the stream lines of air entering the casing l so that the full eiiiciency oi the fan may be obtained.

It may be desirable Where the fan blades are inclined to provide a baille to prevent the grain from striking against the air inlet wall of the fan casing. n Fig. 3 l have shown such a battle as consisting of a ring; l0, fast to the side edges olf the fen blades so as to guard the wall in which the air inlet is provided. The baffle 10 simply consists of an annulus or ring fastened in any well known manner to the edges of thev blades as shown. In other respects, the construction of Fig. 3 is approximately the saine as shown in Figs. l and 2. y

What I claim and desire to secure by Letters-Patent is:

1. A fan comprising av casing having aligning, concentric inlets on opposite sides thereof, and an air inipeller eccentric to the inlet openings, the blades of the impeller beingvslightly inclined transversely of the casing.

2. A fan comprising a casing` having aligning, concentric inlets on opposite sides thereof, an air inipeller eccentric to the inlet openings, the blades of the irnpeller being 'slightly inclined transversely of the casing, and a guard wallconnected to the side edges of theblade's of the l.irnpellerz 3. A fan comprising a. casing having aligning, concentric openings in itsl opposite end walls eccentric to the casing, and a concentric ilnpeller 'within the casing having radial blades inclined transversely of the casing. v y

4. A fan comprising a casing having aligning, concentric openings in its opposite end walls cccen'tricto the casing, a concentric iinpeller within the casing having radial blades inclined transversely of the casing, and a ring-shaped guard connected to the forwardly tilted edges of the blades ntestimony whereof I affix my signature. i

= HALBERT C. WALLACE. 

